JP2795035B2 - Satellite communication earth station equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a supervisory control system of a satellite communication line. In particular, three or more satellite communication earth stations use a request assignment satellite communication system in which two or more transmission paths are shared according to instructions from the control station, and one satellite communication earth station uses a plurality of satellite communication earth stations. The present invention relates to a transmission power control unit for a satellite communication line when a device is present.

[0002]

2. Description of the Related Art Generally, in a request assignment satellite communication system in which three or more satellite communication earth stations share two or more transmission paths for communication, a common transmission path resource is managed and a transmission path is allocated according to a request. A common signal transmission line for transmitting transmission line assignment information between the control station to be assigned and each earth station is required. In the case of the request assignment satellite communication system, each earth station receives a common signal normally sent from the control station,
When there is communication, communication is performed using a communication signal to which a frequency for a communication signal is assigned from a control station using a common signal. When a data communication transceiver of an earth station receives a common signal from a control station and receives a data communication signal from another earth station, the signal is generally a continuous signal. Transmission power control was performed. The voice communication transceiver of the earth station performed transmission power control in the line quality state when receiving a common signal from the control station.However, voice communication with other earth stations was performed by voice driving with instructions from the control station. When performed, the voice communication signal is generally a discontinuous signal. Therefore, it is difficult to monitor the line quality state using a voice communication signal, and voice communication is performed using the transmission power in the line quality state when receiving a common signal from the control station.

[0003] Three or more satellite communication earth stations use a request assignment satellite communication system in which a control station performs communication by sharing two or more transmission paths, and a plurality of satellite communication devices are provided in one satellite communication earth station. The satellite communication earth station which is not the control station when it is present has the configuration shown in FIG. Normally, a common signal transmitted from a control station via a satellite passes through an antenna 1, a low-noise amplifier 2, a reception frequency converter 3, and a distribution unit 11 of a multi-carrier control device 4, and then a data communication transmission / reception device 5 or voice communication. The signal is received by the common signal processing unit 14 through the demodulation unit 13 of the transmission / reception device 7. When the communication signal frequency is designated by the common signal from the control station, the common signal processing unit 14 causes the data communication signal processing unit 15 to set the communication signal frequency to the communication signal frequency.
Alternatively, the frequency control signal 101 is sent to the voice communication signal processing unit 20.
Is passed from the common signal processing unit 14 to the control station through the modulating unit 16, the combining unit 12 of the multicarrier control device 4, the transmission frequency converter 9, the high power amplifier 10, and the antenna 1, The data communication signal processing unit 15 and the data communication signal terminal device 6 or the voice communication signal processing unit 20 and the voice communication signal terminal device 8
Communication is performed by. Among the satellite communication earth stations, the device receiving the common signal calculates the bit error rate from the received common signal in the BER calculation unit 17 and passes the BER status notification signal 102 to the logic unit 18 to change the line degradation bit. When the error state becomes worse, the logic unit 18 passes the transmission power control signal 103 to the transmission output level control unit 19 and raises the level of the transmission power. The data communication transmitting / receiving device 5 performing data communication with another earth station through the data communication signal terminal device 6 receives the common signal because the received data communication signal is a generally continuous signal like the common signal. The transmission power control according to the satellite channel quality state is performed as in the case where However, the voice communication transmitting / receiving device 7 performing voice communication with another earth station through the voice communication signal terminal device 8 is a signal that is generally not continuous due to voice driving. It is difficult to calculate the bit error rate from, and the state of the bit error cannot be monitored. Therefore, a common signal before receiving a voice communication signal is received, and voice communication is performed while transmission power control in the line quality state at that time is performed. That is, when voice communication is performed, the line quality state is not known, and even if the line quality suddenly deteriorates due to rainfall or the like, it is impossible to cope with it.

[0004]

As described above, the voice communication transmitting / receiving apparatus of the satellite communication earth station transmits a common signal from the control station before performing the voice communication when performing voice communication with another earth station by voice driving. Since voice communication is performed while maintaining transmission power control in the line quality state during reception, the voice quality deteriorates if the line quality suddenly drops due to rainfall etc. while performing voice communication was there.

The present invention solves such a drawback, and a satellite communication earth station apparatus in which the voice quality is ensured while the voice communication transmitting / receiving apparatus is performing voice communication with another earth station by a simple configuration. The purpose is to provide.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a plurality of data communication signal transmitting / receiving apparatuses for performing continuous data communication with another satellite communication earth station, and a plurality of voice communication for performing voice communication with another satellite communication earth station by voice. A voice communication signal transmitting / receiving device, a combining unit for combining the data communication transmitting / receiving device and the transmission communication signal from the voice communication transmitting / receiving device and supplying the combined signal to an antenna, and a data communication transmitting / receiving device for receiving a communication signal passing through the antenna And a multi-carrier control device having a distribution unit for distributing to the voice communication transmitting and receiving device, wherein the data communication signal transmitting and receiving device and the voice communication signal transmitting and receiving device specify a common signal transmitted from a control station via a satellite. First means for matching the communication signal frequency of the own station to the communication signal frequency to be started, and thereafter starting communication with the partner station; In the satellite communication earth station device including the second means for calculating the transmission rate and the third means for controlling the transmission power level, the third means of the voice communication signal transmitting and receiving device, during its own communication period, means to another data communication signal transmitting and receiving means and the reference transmit power level control of the second means the own device one bit error rate of the calculated received power of not communicating period voice communication signal transmitting and receiving means of the local station It is characterized by having.

[0007]

In the case where one of the voice communication transmitting / receiving devices is performing voice communication with another earth station, the data is transmitted from the logic portion of the data communication transmitting / receiving device or the other voice communication transmitting / receiving device receiving the common signal from the control station. When it is determined based on the received line quality information that the line error has deteriorated due to the line deterioration, the logic unit passes a transmission power control signal to the transmission output level control unit to increase the transmission power level.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a satellite communication earth station according to an embodiment of the present invention. In this embodiment, as shown in FIG. 1, a plurality of data communication transmitting / receiving apparatuses 5-1 and 5-2 for performing continuous data communication with another satellite communication earth station, and voice driving with another satellite communication earth station. A plurality of voice communication transmitting / receiving apparatuses 7-1 and 7-2 for performing voice communication, data communication transmitting / receiving apparatuses 5-1 and 5-2, and voice communication transmitting / receiving apparatus 7
-1, 7-2 to combine the transmission communication signals from each other and supply them to the antenna, and to transmit the reception communication signal via this antenna to the data communication transmitting / receiving devices 5-1 and 5-2 and the voice communication transmitting / receiving device 7- Distributing unit 1 for distributing to 1, 7-2
1 and a multi-carrier control device 4 having a communication device 1 and a data communication transmission / reception device 5-1, 5-2, and a voice communication transmission / reception device 7-1. The common signal processing unit 14 and the data communication signal processing unit 1, which are first means for starting communication with the partner station after matching the communication signal frequency of the own station with the signal frequency.
5, a BER calculator 17 which is a second means for calculating the bit error rate during reception, and a logic unit 18 and a transmission power level controller 19 which are third means for controlling the transmission power level. As a characteristic feature of the present invention, the third means of the voice communication transmitting / receiving devices 7-1 and 7-2 includes: a data communication signal transmitting / receiving means in the own station; one bit error rate of the received power calculated by the second means communicating signal transmitting and receiving means comprising means for a reference transmission power level control of the device itself.

Next, the operation of this embodiment will be described. FIG.
As shown in (1), a device receiving a common signal or a data communication signal at a satellite communication earth station monitors and controls the quality of a satellite communication line as in the conventional example, but is connected to one multicarrier control device 4. All the logic units 18 of the data communication transmitting / receiving device 5 and the voice communication transmitting / receiving device 7 are connected by the monitor control cable 21, and the voice communication signal processing unit 20 of the voice communication transmitting / receiving device 7 Even if a communication signal is received, the line quality information is transmitted from the logic unit 18 of the data communication transmitting / receiving device 5 connected to the same monitoring control cable 21 or another voice communication transmitting / receiving device 7 receiving the common signal from the control station. When the state of the bit error becomes worse due to the deterioration of the line, the logic unit 18 transmits the output signal in the same manner as the device receiving the common signal or the data communication signal. Transmitted to Le controller 19 power control signal 1
03, the transmission power level is raised, and the voice communication signal modulated by the modulator 16 is transmitted from the voice communication signal processor 20 to another earth station. That is, the line quality state is similarly monitored by all the logic units 18 of the data communication transceiver 5 and the voice communication transceiver 7 in one earth station, and the transmission power is controlled by the transmission output level controller 19 in accordance with each device. Control.

[0010]

As described above, the present invention uses the request assignment satellite communication system in which three or more satellite communication earth stations share two or more transmission paths in accordance with an instruction from a control station. However, when a plurality of satellite communications exist in one satellite communication earth station, the data communication transmission / reception connected by the same monitoring control cable even if the speech communication transceiver is performing voice communication with another earth station by voice drive. Since the line quality status can be monitored from another voice communication transmitting / receiving device receiving a common signal from the device or the control station, the effect of improving the voice quality by raising the transmission power level by knowing the deterioration of the line quality can be monitored. There is.

Also, an apparatus having only a common signal transmitting / receiving section is prepared, the apparatus is connected to a voice communication transmitting / receiving apparatus by a single monitor control cable, and the line quality information is received from the apparatus having only the common signal transmitting / receiving section at any time to transmit power. If you want to control
Since the time during which voice communication data is received by the voice communication transmission / reception device is often short, it is expensive and wasteful to prepare a device having only a common signal transmission / reception unit. However, the present invention uses a single cable. There is an effect that such a disadvantage can be solved by an inexpensive and simple method.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Low noise amplifier (LNA) 3 Receiving frequency converter (D / C) 4 Multicarrier control device 5 Data communication transmitting / receiving device 6 Terminal device for data communication signal 7 Voice communication transmitting / receiving device 8 Terminal device for voice communication signal 9 Transmission Frequency converter (U / C) 10 High power amplifier (HPA) 11 Distribution unit 12 Synthesis unit 13 Demodulation unit 14 Common signal processing unit 15 Data communication signal processing unit 16 Modulation unit 17 BER calculation unit 18 Logic unit 19 Transmission output level control Unit 20 voice communication signal processing unit 21 monitoring control cable

Claims (1)

(57) [Claims] A plurality of data communication signal transmitting / receiving apparatuses for performing continuous data communication with another satellite communication earth station; a plurality of voice communication signal transmitting / receiving apparatuses for performing voice communication with another satellite communication earth station by voice driving; A combining unit that combines transmission communication signals from the data communication transmission / reception device and the voice communication transmission / reception device and supplies the combined signal to an antenna, and distributes a reception communication signal transmitted through the antenna to the data communication transmission / reception device and the voice communication transmission / reception device A data communication signal transmitting / receiving device and a voice communication signal transmitting / receiving device, wherein the data communication signal transmission / reception device and the voice communication signal transmission / reception device have a communication signal frequency designated by a common signal transmitted from a control station via a satellite. First means for matching the communication signal frequency and then starting communication with the partner station, and second means for calculating the bit error rate during reception And a third means for controlling the transmission power level, wherein the third means of the voice communication signal transmitting / receiving apparatus comprises, during the communication period of the own apparatus, another data communication signal in the own station. characterized in that one of the transmitting and receiving means and the bit error rate of the received power calculated by the second means voice communication signal transmitting and receiving means it is not in communication period comprising means for the reference transmission power level control of the device itself Satellite communication earth station equipment.